Data Model Patterns: Conventions of Thought by David C. Hay

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Chen, for example: "The Entity-Relationship ModelToward a Unified View of Data," ACM Transactions on Database Systems, Vol. 1 (1976). Chen's notation shows attributes in circles connected to, but separated from, entities. G. Ross. The Business Group, 1994). Rule Book (Boston: Database Research 3 THE ENTERPRISE AND ITS WORLD specified without interviewing anyone. You know that they will be required, no matter what the business. startenterprise the modeling exercise somepeople. entities Whether that can an be An cannot exist with without employee, a vendor agent, or the president of a company, a PERSON can be assumed to be a "thing of significance" to most companies.

That. is, the list of values for the attribute is documented in the data dictionary as a relatively THE ENTERPRISE AND ITS WORLD 45 fixed list. Alternatively, if the list is also comparatively short, each of the "... types" could be shown as a subtype of REPORTING RELATIONSHIP. If the list is more dynamic and variable, however, or if there is a reason to display the fact that such a list exists, it can be shown in the model as a ney\' entity. This entity can be named REPORTING RELATIONSHIP TYPE, where each REPORTING RELATIONSHIP must be an example of one and only one REPORTING RELATIONSHIP TYPE, and each REPORTING RELATIONSHIP TYPE may be embodied in one or more REPORTING RELATIONSHIPS.

In all these cases, it will be your job as a modeler first to recognize the products an organization uses and produces, and then to see how they are related to each other, to other aspects of the enterprise, and to its mission. Whereas PRODUCTS AND PRODUCT TYPES Understanding this part of the model requires a mental grouping of things frequently thought of as distinct, and, conversely, the drawing of a distinction beh'veen tY\'othings often treated together. First the distinction: For a model to make sense, it is essential to distinguish between the specification of things and the physical things themselves.